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Fatigue fracture behaviour of spot welded B1500HS steel under tensile‐shear load
Author(s) -
Wang B.,
Duan Q. Q.,
Yao G.,
Pang J. C.,
Zhang Z. F.,
Wang L.,
Li X. W.
Publication year - 2015
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12289
Subject(s) - materials science , spot welding , martensite , tempering , welding , ultimate tensile strength , metallurgy , microstructure , shear (geology) , composite material , ferrite (magnet) , fatigue testing
The microstructural characterizations, micro‐hardness measurements and fatigue tests of B1500HS steel spot welded tensile‐shear specimens were performed. The high hardness values of base material (470 HV) and nugget (515 HV) are closely related to the dominant formation of martensitic microstructures, while the occurrence of soft zone is the result of the formation of ferrite phases in inter‐critical heat‐affected zone (HAZ), as well as martensite tempering in sub‐critical HAZ. The fatigue failure modes involve the fracture along the circumference or along the direction of width. The fatigue property of spot welded B1500HS is found to be better than that of spot welded M190 because of the thicker sheet and suitable nugget size, which follows the standard rule of 5 t 0.5 , where t is the sheet thickness.